I recently was engaged to write an article on how RavenDB indexing compares to MongoDB and PostgreSQL. I had a lot of fun writing it because I finally got to dive deeper into how MongoDB and PostgreSQL query engines work under the covers. I was actually surprised to be honest, I thought that MongoDB was more similar to RavenDB but it ended up being quite different.
Read more about the role indexing plays in RavenDB vs. MongoDB and PostgreSQL
If this interests you be sure to check out my Getting Started with RavenDB 4 course on Pluralsight.